Amount of budgeted value of development communities.

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Amount of real estate intangible assets acquired at the acquisition date.

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Amount of carrying value of development communities.

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Represents the number of mortgage notes payable.

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Gain from the consolidation from the purchase of an unconsolidated joint venture.

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Number of apartment homes acquired.

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Number Of Apartment Homes Owned And Consolidated By Company

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Number of Communities Acquired

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Number of communities sold.

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Number of communities under development.

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The number of communities under development purchased.

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Number of credit facilities.

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Number Of homes Under Development.

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Number of remaining communities sold.

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Real estate owned.

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Represents element information pertaining to sale value of joint venture.

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Represents the total value of the joint venture portion that was purchased.

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Amount of assets acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The number of real estate properties owned as of the balance sheet date.

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The number of states the entity operates in as of the balance sheet date.

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The number of units in a real estate property owned as of the balance sheet date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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REAL ESTATE OWNED - Additional Information (Details)	1 Months Ended														12 Months Ended
REAL ESTATE OWNED - Additional Information (Details)	Jan. 31, 2020 item	Jan. 31, 2020 USD ($)	Jan. 31, 2020 home	Nov. 30, 2019 USD ($) item community	Nov. 30, 2019 USD ($) community	Nov. 30, 2019 USD ($) community	Nov. 30, 2019 USD ($) property community	Aug. 31, 2019 USD ($) home	Jun. 30, 2019 USD ($) home	May 31, 2019 USD ($) home	Apr. 30, 2019 USD ($) home	Feb. 28, 2019 USD ($) home	Jan. 31, 2019 USD ($) item home	Dec. 31, 2017 community	Dec. 31, 2019 USD ($) state home community item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 31, 2019
Real Estate Owned Disclosure
Number of real estate properties \| community															148
Number of states in which there are owned and consolidated communities \| state															13
Number of apartment homes owned and consolidated \| home															47,010
Long term debt fair value				$ 551,800,000	$ 551,800,000	$ 551,800,000	$ 551,800,000
In-place intangibles															$ 40,570,000
Gain on consolidation					0
Development of real estate assets					$ 977,800,000										25,401,000	$ 150,238,000	$ 248,546,000
Real estate held for investment															12,532,324,000	$ 10,196,159,000
Long-term Debt															$ 4,698,686,000
Number Of Credit Facilities				1	1	1	1
Number of land parcels \| property							4
Number of communities under development															3
Number of homes under development \| home															878
Budgeted value															$ 278,500,000
Carrying value															$ 69,800,000
In-place lease
Real Estate Owned Disclosure
Real estate held for investment				$ 30,000,000.0	$ 30,000,000.0	$ 30,000,000.0	$ 30,000,000.0
LAND
Real Estate Owned Disclosure
Proceeds from sale of real estate									$ 38,000,000.0
Orange County and Carlsbad Properties
Real Estate Owned Disclosure
Number of communities sold \| community														2
LAND
Real Estate Owned Disclosure
Proceeds from sale of real estate									38,000,000.0
Gain on sale of real estate owned									$ 5,300,000
386 Home Operating Community In Anaheim
Real Estate Owned Disclosure
Number of apartment homes \| home													386
Number of apartment homes acquired \| home													386
Ownership (as a percent)													100.00%		49.00%	49.00%
Payment to acquire real estate													$ 33,500,000
Repayments of joint venture construction financing													59,800,000
Real estate acquired													115,700,000
In-place intangibles													2,400,000
Gain on consolidation													$ 0
155 Home Operating Community in Seattle
Real Estate Owned Disclosure
Number of apartment homes \| home													155
Number of apartment homes acquired \| item													155
Ownership (as a percent)													100.00%		49.00%	49.00%
Real estate intangibles													$ 2,400,000
Payment to acquire real estate													20,000,000.0
Repayments of joint venture construction financing													26,000,000.0
Real estate acquired													58,100,000
In-place intangibles													600,000
Gain on consolidation													0
To-Be-Developed Parcel of Land in Washington D.C
Real Estate Owned Disclosure
Payment to acquire real estate													$ 27,100,000
To Be Developed Parcel Of Land In Denver, Colorado
Real Estate Owned Disclosure
Payment to acquire real estate												$ 13,700,000
Operating Community in Brooklyn, New York
Real Estate Owned Disclosure
Number of apartment homes acquired \| home												188
Real estate intangibles												$ 33,600,000
Payment to acquire real estate												132,100,000
Real estate acquired												97,500,000
In-place intangibles												$ 1,000,000.0
Operating Community in St. Petersburg, Florida
Real Estate Owned Disclosure
Number of apartment homes acquired \| home										240		381
Payment to acquire real estate										$ 49,400,000		$ 98,300,000
Real estate acquired										48,200,000		96,000,000.0
In-place intangibles										$ 1,200,000		$ 2,300,000
Operating Community in St. Petersburg, Florida \| Subsequent Event
Real Estate Owned Disclosure
Payment to acquire real estate		$ 85,200,000
Number of communities acquired \| home			294
Operating Community in Towson, Maryland
Real Estate Owned Disclosure
Number of apartment homes acquired \| home											498
Payment to acquire real estate											$ 86,400,000
Real estate acquired											82,500,000
In-place intangibles											$ 3,900,000
Operating Community in King of Prussia, Pennsylvania
Real Estate Owned Disclosure
Number of apartment homes acquired \| home										313
Payment to acquire real estate										$ 107,300,000
Real estate acquired										106,400,000
In-place intangibles										$ 900,000
Operating Community in Waltham, Massachusetts
Real Estate Owned Disclosure
Number of apartment homes acquired \| home									200
Payment to acquire real estate									$ 84,600,000
Real estate acquired									82,600,000
In-place intangibles									$ 2,000,000.0
Operating Community in Norwood, Massachusetts
Real Estate Owned Disclosure
Number of apartment homes acquired \| home								914
Payment to acquire real estate								$ 270,200,000
Real estate acquired								260,100,000
In-place intangibles								$ 10,100,000
Operating Community in Englewood, New Jersey
Real Estate Owned Disclosure
Number of apartment homes acquired \| home								185
Real estate intangibles								$ 4,600,000
Payment to acquire real estate								83,600,000
Real estate acquired								77,500,000
In-place intangibles								$ 1,500,000
Unconsolidated Joint Venture Three Washington DC
Real Estate Owned Disclosure
Number of apartment homes owned and consolidated \| home								292
Ownership (as a percent)								100.00%										30.00%
Cash purchase price ( as a percent)								100.00%
Acquisition-related costs								$ 2,800,000
Payment to acquire real estate								184,000,000.0
Acquisition-related costs								2,800,000
Real estate acquired								156,000,000.0
In-place intangibles								5,900,000
Gain on consolidation								$ 0
Number of communities sold \| home								292
UDR/MetLife operating communities
Real Estate Owned Disclosure
Ownership (as a percent)				50.00%	50.00%	50.00%	50.00%
Payment to acquire real estate					$ 109,200,000
Gain on consolidation					114,900,000										$ 131,500,000
Debt instrument, number of mortgage notes payable \| item				6
Long-term Debt				$ 518,400,000	518,400,000	$ 518,400,000	$ 518,400,000
Number of communities acquired \| community						10									10
Number of communities sold \| community						5
Number of communities under development purchased \| community						1									1
Number of land parcels				4			4								4
Total value of joint venture portion that was purchased				$ 1,100,000,000	1,100,000,000	$ 1,100,000,000	$ 1,100,000,000
Total value of joint venture that was purchased - UDR's share					564,200,000
Total value of joint venture portion that was sold				$ 645,800,000	$ 645,800,000	$ 645,800,000	$ 645,800,000
Number of communities sold \| community				5	5	5	5
Sale value of joint venture					$ 645,800,000
Sale value of joint venture UDR's share					$ 322,900,000
Preferred Equity Investment Hillsboro Oregon
Real Estate Owned Disclosure
Ownership (as a percent)															49.00%
Preferred Equity Investment Hillsboro Oregon \| Subsequent Event
Real Estate Owned Disclosure
Number of apartment homes acquired	276		276
Ownership (as a percent)	100.00%	100.00%	100.00%
Payment to acquire real estate		$ 21,600,000
Repayments of joint venture construction financing		$ 35,600,000